Block and bar shears



B. QUAST. BLOCK AND BAR SHEARS. APPLICATION mw MAR. 9. Isla.

Patented Allg. 17, 1920.

UNITED STATES ammo Quasar,

or cLN-DEUTZ, rnUssIA, GERMANY.

BLOCK AND BAR SHEARS. J

Specication of Letters Patent.

Patented Aug. 17 1920.

Application led March 9, 1918. Serial No. 221,573.

To all whom it may concern.'

Be it known that I, BRUNO QUAsT, a subject to the King of Prussia,German Emperor, residing at No. 9 Reischplatz, Coln- Deutz,

provide a simplified and improved device of A this character which shallreduce materially the weight, lessen the cost and render less difficultthe operation.

Other objects and advantages of the invention will hereinafter appearand the novel features thereof will be particularly pointed out in theappended claims.

The invention is clearly illustrated in the accompanying drawings,which, with the numerals of reference marked thereon, .form a )art ofthis specification, and in whichigure 1 is a vertical section of thedevice complete, and

Fig. 2 is a vertical section of a modified form.

Like numerals of reference indicate like parts in the two views.

Referring first to Fig. 1, a, designates a crank shaft mounted insuitable bearings and adapted by means of cranks and links g to impartmotion to a double-armed lever b, which latter is mounted for movementon the'pivot d, the upper cutterhead c being carried by said pivot. Thedouble-armed lever b is fulcrumed on the fulcrum e to which is pivotallyconnected the draft bar f, to the lower end of which is pivotallyconnected one end of the single-armed lever h, which latter is pivotallymounted, as at i, in a bearing on the frame of the machine.

'To this lever h is connected the lower cutter head 7n, by means oflinks Z mounted upon the pivots c.

o are draft bars disposed between the crank shaft a and the pivot z', asillustrated.

In operation, motion `is imparted to the double-armed lever b by meansof the cranks and links g actuated from the crank shaft a and during thedownward movement of the upper cutter head the double-armed lever b willonly act on said cutter head as a singlearmed lever. As soon as theupper cutter head has reached the lowest point of its sequently,

stroke, the said lever b will turn upon the supporting pivot d, thelatter now offering greater resistance than the fulcrum e. Conthe leverb will then act as a double-armed lever, raising the draft bar f and,consequently, the lever h.. The latter turns upon the fulcrum i. Duringthe upward movement of the lower cutter, the block shown in position inFig. 1 between the two cutters, is severed, after which the returnmovement of the two cutter heads is brought about, the lower cutter headbeing lowered first and the upper cutter head beginning to rise as soonas the lower cutter head has reached its lowermost position.

In the form shown in Fig. 2, the operation is substantially the sameexcept that the double-armed lever b acts as such during the descent ofthe upper cutter head and as a single-armed lever during the upwardmotion of the lower cutter head. The only di'erence between the twoconstructions is practically that in the form shown in Fig. 1 the draftbar f and the crank shaft a, are located at opposite sides of the twocutter heads, thus inclosing the same between them, while in the formshown in Fig. 2 the two cutter heads c and m are located at the sameside of the crank shaft with the draft bar f.

The links 0 serve to take up and resist the counterforces arising in thecrank shaft a and supporting point t', said links 0 serving to take upall forces with the exception ot' the shearing power proper employed tosever the block and absorbed by the shearing of said block.

It is to be understood that there is a draft bar f and a draft bar o ateach side of the machine, but only one of each is seen in the sectionalviews.

The standard p serves to guide the cutter heads and to carry thebearings of the driving gear and this will not undergo any otherpressures than sundry lateral forces occuring during theseveringoperation of the block and some slight pressures of the teeth of thedriving gear.

vWhat is claimed as new 1. In a block-and-bar shearing machine, thecombination with a crank shaft, of upper and lower cutter heads, a levercarrying one of the cutter heads and operatively connected with thecrank shaft, a lever connected with the other cutter head, a draft barconnection between said levers, one of 10 nected with the other cuttersaid levers serving as a single-armed lever for a portion of itsmovement and as a double-armed lever for the remainder of its movement.

2. In a block-and-bar shearing machine,

the combination with a crank shaft, of up per and lower cutter heads, alever carrfing one of the cutter heads and operative y connected withthe crank shaft, a lever conhead, a draft bar connection between saidlevers, one of said levers serving as a single-armed level" for aportion of its movement and as a double-armed lever for the remainder ofits movement, said crank shaft and draft bar being located at oppositesides of the cutter eads.

In testimony whereof I have ailixed my signature.

BRUNO QAST.

